Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On / Vehicle - In Service Mode
Verify DTC P0641, P0651, P0697, P06A3 is not set.
- If any of the DTCs are set
  Refer to: DTC P0641, P0651, P0697, or P06A3
- Go to next step: If none of the DTCs are set
Verify the scan tool parameter: Manifold Absolute Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
- If not in the specified range
  Refer to: Circuit/System Testing
- Go to next step: If in the specified range
Engine - Idling - At normal operating temperature.
Accessories - Off
Verify the scan tool parameter: Manifold Absolute Pressure Sensor = 26 to 52 kPa (3.8 to 7.5 PSI)
- If not between 26 and 52 kPa (3.8 and 7.5 PSI)
  Refer to: Circuit/System Testing
- Go to next step: If between 26 and 52 kPa (3.8 and 7.5 PSI)
Verify the scan tool parameter: Manifold Absolute Pressure Sensor = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B65 Manifold Absolute Pressure and Intake Air Temperature Sensor
- Wiggle the harness and connector: K20 Engine Control Module
- If the value spikes or drops out
  Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)
- Go to next step: If the value does not spike or drop out
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
All OK.